tuple.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.web.wfs.data.query.sql;

public class Tuple {
	protected WhereClauseToken _leftOperand;
	protected WhereClauseToken _relationalOperator;
	protected WhereClauseToken _rightOperand;
	
	public Tuple() {
		_leftOperand = null;
		_relationalOperator = null;
		_rightOperand = null;
	}
	
	public WhereClauseToken getLeftOperand() {
		return _leftOperand;
	}
	
	public void setLeftOperand(WhereClauseToken operand) {
		_leftOperand = operand;
	}
	
	public WhereClauseToken getRelationalOperator() {
		return _relationalOperator;
	}
	
	public void setRelationalOperator(WhereClauseToken operator) {
		_relationalOperator = operator;
	}
	
	public WhereClauseToken getRightOperand() {
		return _rightOperand;
	}
	
	public void setRightOperand(WhereClauseToken operand) {
		_rightOperand = operand;
	}
	
	public boolean isEmpty() {
		return (_leftOperand == null) && (_relationalOperator == null) && (_rightOperand == null);
	}
	
	public boolean isComplete() {
		return (_leftOperand != null) && (_relationalOperator != null) && (_rightOperand != null);
	}
	
	public void pushOperand(WhereClauseToken operand) throws InvalidSyntaxException {
		if (_leftOperand == null) {
			_leftOperand = operand;
		}
		else if (_relationalOperator == null) {
			throw new InvalidSyntaxException("Can not place right hand operand before operator");
		}
		else if (_rightOperand != null) {
			throw new InvalidSyntaxException("Can not place 2 right hand operands");
		}
		else {
			_rightOperand = operand;
		}
	}
}